Many thanks Graham , Ian Ellis , my engine builder won't touch synthetc oils for these NORD ally twincams. Only uses mineral oil due to the synthetics additive package --- some things not wanted in the package and others missing from it , particularly for running in. Apparently they don't allow ' wearing ' in being so slippery. It'll have Valvoline in there when I get it back then unless he advises against , I'll drain at 600 and refill with Millers Classic Performance 20w50 NT.
I've used Millers 5w40 NT Synthetic race in my Stylus Sprint car ever since it came out. Just itching to get it home now that I'm 8 weeks post hip resurfacing(got two now !!!)
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